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Armband Size Guide

Upper arm circumference

How to Measure

  1. 1Wrap a flexible tape measure around your upper arm
  2. 2Measure at the fullest part (mid-bicep)
  3. 3Note in inches or centimeters

Size chart

Size Inches cm
Standard Armband 8.5″ – 15.5″ 21.5 – 39 cm
Extra-Long Armband 12.5″ – 18.5″ 31.5 – 47 cm
Both armbands fit most body types.
Additional bra extenders can be purchased at any store if larger sizing is required.

Fertility Q&A

Can I chart with a copper IUD?

Birth control

Can I chart with a copper IUD?

Yes! You can chart your cycles with a copper IUD if you want. Some find charting with a copper IUD to be slightly more difficult than without it, but it is a very valid option.

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Birth control

I just came off hormonal birth control - how long do I have to wait before I can trust fertility awareness for family planning?

This is highly dependent on the person. If you choose to self-teach, most methods suggest waiting at least 3 full cycles before starting to trust fertility awareness on its own for family planning....

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Birth control

Can I chart while on hormonal birth control?

You can chart your symptoms while on hormonal birth control, but most hormonal birth control suppresses ovulation, so you won’t have “complete” charts, and they may be confusing to understand. Char...

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Birth control

I just came off hormonal birth control - how long should I wait to start charting?

You can start charting right away after coming off hormonal birth control. In fact, you can even start charting symptoms before coming off hormonal birth control!

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Birth control

How effective is fertility awareness in family planning?

Fertility awareness can be up to 99.6% effective for family planning. The study that produced this result was based on the Sensiplan (a symptothermal, double-check, method), learned under a qualifi...

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Fertility Awareness

What resources do I need to get started?

Getting started with a fertility awareness method is easy! You’ll need to choose a method and way of learning. Beyond that, tools depend on your method. We suggest grabbing a Tempdrop to make your ...

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Fertility Awareness

What are the benefits of charting?

Women choose to chart their cycle (practice fertility awareness) for many reasons. It can be used to monitor health, avoid or achieve pregnancy or just for learning to understand your body better. ...

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Fertility Awareness

Isn’t fertility awareness just for conception?

No! In easy terms, fertility awareness is exactly what it sounds like: being aware of your cycle and fertility status. It’s useful for all sorts of things: increasing chances of conception, family ...

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PdG & LH Test Strip

What can an OPK tell me?

An OPK can tell you that there is LH in your urine. That means that your body is gearing up to ovulate. An OPK can only tell if you are likely to ovulate, not that you have ovulated.

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Fertility symptoms

What do I need to track temperature?

You need a thermometer specifically designed for measuring basal body temperature (fever thermometers aren’t precise enough). Tempdrop will simplify your temping routine!

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